Re: [Asrg] 6. Proposals: MTA MARK vs port 25 filtering?

[Daniel Feenberg <feenberg@nber.org>]

On Sun, 14 Dec 2003, Marc A. Pelletier wrote:

> Brett Watson <famous-asrg@nutters.org> sayeth:
> 
> For a strictly technical reason, mind you.  If port 25 becomes predominantly
> filtered, email is slimply going to shift ports.  We will see an increase of
> proxies over port 80 (most likely), and the corresponding abuse.
> 

This I don't understand. I don't run an MTA at port 80, so I don't receive
any spam via that port. Nor does anyone else I know, nor can I conceive of
any reason I might start doing so. 

Perhaps you are confused by lax terminology. When anti-spammers speak of
filtering port 25, they mean packets destined to port 25 on the remote
system. That is the only port that accepts mail from strangers on most
systems. 

Daniel Feenberg




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